P. Singer, D. Helic, A. Hotho, and M. Strohmaier. International Conference on World Wide Web, page 1003--1013. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2015)
O. Saukh, D. Hasenfratz, and L. Thiele. Proceedings of the 14th International Conference on Information Processing in Sensor Networks, page 274--285. ACM, (2015)